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    <title>图书管理系统</title>
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                    <li class="sidebar-item"><a class="sidebar-link waves-effect waves-dark sidebar-link" aria-expanded="false" href="managequerybook.html"><i class="mdi mdi-view-dashboard"></i><span class="hide-menu">查询图书</span></a></li>
                    <li class="sidebar-item"><a class="sidebar-link waves-effect waves-dark sidebar-link" aria-expanded="false" href="usersearch.html"><i class="mdi mdi-view-dashboard"></i><span class="hide-menu">查询读者信息</span></a></li>
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                <div class="col-12 d-flex no-block align-items-center">
                    <h4 class="page-title">归还图书</h4>
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            <div class="row">
                <div class="col-12">
        <div class="card" style="width: 60%; margin-left: 20%">
            <div class="card-body">
                <div class="table-responsive" >
                <center>
                <br/><br/>
                <p>请选择图书状态:</p><div class="col-md-9">
                <select id="condition" class="select2 form-control custom-select" style="width: 30%; height:36px;">
                <option value="normal">正常</option>
                <option value="lost">遗失</option>
                <option value="broke">严重破损</option>
                <option value="smeared">有胡乱涂抹</option>
                </select>
</div><br/><br/>
    <p>请输入罚款金额（默认为0）:</p>
    <input style="width:10%;height:30px;text-align: center" type="number" value=0 id="fine" />
<br/><br/>
    <p>备注:</p>
    <div class="col-sm-9">
    <textarea id="remark"class="form-control" style="width: 50%"></textarea>
    </div>
<br/>
    <div class="border-top"><br/>
        <button type="button" class="btn btn-outline-dark" onclick="returnbook()">归还图书</button>
    </div>

</center>
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        </div><footer class="footer text-center"><br/><br/><br/><br/>Written by weh <a target="_blank"></a>
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</div>
<script type="text/javascript">
    var bookId = getCookie("bookId")
    var borrowId=getCookie("borrowId")
    function getCookie(cname){
        var name= cname+"=";
        var ca=document.cookie.split(';');
        for(var i=0;i<ca.length;i++){
            var c=ca[i].trim();
            if(c.indexOf(name)==0)
                return c.substring(name.length,c.length);
        }
        return "";
    }
    function returnbook() {
        var condition=document.getElementById("condition").value
        var fine=document.getElementById("fine").value
        var remark=document.getElementById("remark").value
        if(condition=="normal"||condition=="smeared"){
            AddReturnInfo(condition,fine,remark)
            UpdateRemain()
        }
        else{
            AddReturnInfo(condition,fine,remark)
        }
        alert("处理完成。")
        window.open("queryuserborrow.html","_self")
    }

    function AddReturnInfo(condition,fine,remark) {
        $.ajax({
            type:"POST",
            url:"/returnInfo",
            data:{
                borrowId:borrowId,
                condition:condition,
                fine:fine,
                remark:remark
            },
            dataType:"json",
            Async:false
        })
    }
    function UpdateRemain() {
        $.ajax({
            type:"PUT",
            url:"/books/remain/"+bookId,
            dataType:"json",
            success:function(result){
                DeleteReservation()
            }
        })
    }
    function DeleteReservation() {
        $.ajax({
            type:"DELETE",
            url:"/reservation/"+bookId,
            dataType:"json",
            Async:false
        })
    }
</script>
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